Process of making hollow metallic balls.



J. W. SGHATZ. PROCESS OF MAKING HOLLOW METALLIC BALLS.

APPLICATION FILED JULY 11, 1911. 4

Patented Sept. 24, 1912 WWW:

' groan w. sc -mien. orfrouonxnnrsin, new YGEK, nssronon or own-Heir Towere them that they 7 reduced weight and that their yielding quality orelasticity shall be practically uni- 1. SCHATZ, OF IOUGHKEEPSIE, NEWYORK.

rno'cn ss or mnnrnsnonrow METALLIC Barns.

To all it may comm: r

Be itknown that 1; JOHN SGHATZ, a citizen of the United- 'States, and-aresident ofethe city of Poughkeepsie, county of But-chess, StateofNewiYork, have invented anew and useful Process'of Making HollowMetallic Balls, of which the following is a specification, referencebeinghad to the accompanylng drawings.

The purpose'of-this invention is to reduce the cost of meta'Bic ballsand to so construct shall be 'semiel astic, of

form throughout against pressures coming from any and all d1rections.

Referring to the drawings, Figure 1 illus-- trates a'medial sectionalView of a hall in process of construction; Fig.2 illustrates one form ofclosure'ilsed to close or fill the opening left in the ball as shown inFig. 1; Fig. 3 illustrates the ball of Fig. 1 with the closure of Fig. 2in position within the holein the ball ready for the welding andcompressing operations; Fig. 4' illustrates the structure after theclosure has been welded in place within the hole in the hall.

For a general description of the balls'contemplated in this invention,their uses and general method of construction, I refer to United StatesLetters Patent No. 955,698, granted to me and dated April 19,'1910, uponwhich this present invention is in some respects and for certain uses animprovement. y

In the drawings 1. represents the blank from which the ballis madeafterrit has been submitted to the swaging or forming operationsreferred to in said patent up'to the point at which the ball ispractically spherical in shape, having, however, usually slightlygreater diameter on the transverse the closureplug in the general formof a truncated cone, as shown, but .it ma be given any other suitableshape andnee not be specially made for this purpose; that Specificationof Letters Patent. Patented s i, g Ap re ation new July-11, 1911.

Serial No. 637,882.

is to say,'a-n ordinary rivet the hea-duof which is of suitable size andpreferably round, or a round headed screw maybe used in place of theconical plug ill but if so, the shank of the rivet or screw, which willusually project radially after the weldmg operation has been performedshould be out off before the make the-hall spherica The method orprocess is as follows The i closure, whether a button,plug,-rivet adgin-riding oper tio'n to v or' screw head, is first placedintheliole'the ball as shown in Fig.- ,3,fthe*parts' so assembled are thensubjected. to thee em: tion of an electrlc welding culrentorai-j low apipe jet or equivalent heating means, are;

the parts become very hot, usually a white the outer surface or end ofthe closure, whereby, it -IS forced inwardly toward the center of theball. The result. will be that heat approaching the fuSiHgp0iIit-;;wlll;l)6y produce perfect yvorlr',: good results can besecures-by" a" the closure whatever its form many he will be forced intothehole in the bii 'l and the contacting metal surfaces will beintimately forced together and intermeshed constituta ing a mostperfectly welded joint no line of union can'be detected.

I usually apply such a degree of pressure that the metal shall bulgeinwardly somewhat as shown at 4 in Fig. 4, but this is not necessary. Ifthe partly formed ball be oblong to any degree as is sometimes the case,as suggested above, then the pressure may beneficially be such and thedie or former by which the pressure is applied be ofsuch more nearlyspherical 'form thereby, thus making the finished article more perfectand reducing the amount of grinding required. Also if specially madeclosures are used, such as the but-ton or plug illustrated in Fig. 2, Iprefer to make them of such size and shape that when the weldingoperation is completed, their outer surface willbe about flush witlf theouter'surface of the ball, as shown at 5 in Fig? 4.

After the welding has been accomplished the balls are submitted to theaction of in which shape that the ball will be swaged into a,

manner well known.

suitable grinding mechanism whereby they are made truly spherical andpolished in a my invention retained. I do not therefore limit myself tosuch details.

I claim: 7 c

1. The method describedconsisting in taking a substantially spheri'alhollow metallic body having a hole in one side, applying a suitablemetallic closupg, larger than the hole upon the hole, heating theclosure. and the metal of the body adjacent to the hole and thenpressing the closure into the hole.

2. The method described consisting in taking a substantially sphericalhollow metallic body having a hole in one side, applying a suitablemetallic closure larger than the hole upon the hole, heating the closureand the metal of the body adjacent to the hole, pressing the closureinto, the hole and grinding the resulting 'ball into substantiallyaccurate spherical form..

3. The method described consisting in taking a substantially sphericalhollow -metallic body having greater diameter in one direction than inthe opposite direction and having a hole in the axis of the longerdimension, applying a suitable metallic closure larger than the holeupon the hole, welding the same therein and swaging the body into morenearly spherical form by the aid of heat and pressure.

4. The method described consisting in taking a metallic body having ahole in one side, applying a suitable closure larger than the hole uponthe hole, heating the closure and' the metal of the body adjacent to thehole, pressing the closure into the body until the outer surface of theclosure is substantially even with the outer surface of the body andthen grinding the resulting article in spherical form.

5. The method described consisting in taking a substantially sphericalhollow metallic body having a hole in one side, applying a suitableclosure larger than the hole upon the hole, heating the closure and themetal of the body adjacent tothe hole, and pressing the closure into thebody until the outer surface of the closure is substantially even withthe outer surface of the body.

y In testimony whereof I have signed my substantially spherical hollowname to this specification inthe presence of two subscribing witnesses.

JOHN W. SOHATZ. lVitnesses:

Gno. WORRALL, MAnonnnirn BooK.

